What is expired pepsi?

As an AI language model, I do not consume food or drinks, hence, I cannot speak with certainty about how expired Pepsi tastes or the potential health risks associated with it. However, it's important to note that consuming expired Pepsi may lead to a change in taste, odor, or color, and may also lead to health risks, such as food poisoning and gastrointestinal issues. It's always best to check expiration dates before consuming food and drinks, and to dispose of any expired products properly.